<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    姓名:<input type="text" name="username" title="用户名必填" required> <br>
    邮箱：<input type="email" name="email"> <br>
    URL地址：<input type="url" name="homepage"> <br>
    <input type="text" value="" placeholder="请填写您的电话*" title="电话号码格式不正确" pattern="^1[0-9]{10}$" required>
</body>
</html>